.parallax {
    height: 500px;
    /* fallback for older browsers */
    height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-perspective: 300px;
    perspective: 300px;
    -webkit-perspective-origin-x: 100%;
    -ms-perspective-origin-x: 100%;
}

.parallax__group {
    position: relative;
    height: 500px;
    /* fallback for older browsers */
    height: 100vh;
    -webkit-transform-style: preserve-3d;
    transform-style: preserve-3d;
}

.parallax__layer {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    -webkit-transform-origin-x: 100%;
    -ms-transform-origin-x: 100%;
}

.parallax__layer--fore {
    -webkit-transform: translateZ(90px) scale(.7);
    transform: translateZ(90px) scale(.7);
    z-index: 1;
}

.parallax__layer--base {
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    z-index: 4;
}

.parallax__layer--back {
    -webkit-transform: translateZ(-300px) scale(2);
    transform: translateZ(-300px) scale(2);
    z-index: 3;
}

.parallax__layer--deep {
    -webkit-transform: translateZ(-600px) scale(3);
    transform: translateZ(-600px) scale(3);
    z-index: 2;
}


/* demo styles
  --------------------------------------------- */

body,
html {
    overflow: hidden;
}

body {
    font: 100% / 1.5 Arial;
}

* {
    margin: 0;
    padding: 0;
}

.parallax {
    font-size: 200%;
}


/* centre the content in the parallax layers */

.title {
    text-align: center;
    position: absolute;
    left: 50%;
    top: 50%;
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}


/* style the groups
  --------------------------------------------- */

#group1 {
    z-index: 5;
    /* slide over group 2 */
}

#group1 .parallax__layer--base {
    background: rgb(102, 204, 102);
}

#group2 {
    z-index: 3;
    /* slide under groups 1 and 3 */
}

#group2 .parallax__layer--back {
    background: rgb(123, 210, 102);
}

#group3 {
    z-index: 4;
    /* slide over group 2 and 4 */
}

#group3 .parallax__layer--base {
    background: rgb(153, 216, 101);
}

#group4 {
    z-index: 2;
    /* slide under group 3 and 5 */
}

#group4 .parallax__layer--deep {
    background: rgb(184, 223, 101);
}

#group5 {
    z-index: 3;
    /* slide over group 4 and 6 */
}

#group5 .parallax__layer--base {
    background: rgb(214, 229, 100);
}

#group6 {
    z-index: 2;
    /* slide under group 5 and 7 */
}

#group6 .parallax__layer--back {
    background: rgb(245, 235, 100);
}

#group7 {
    z-index: 3;
    /* slide over group 7 */
}

#group7 .parallax__layer--base {
    background: rgb(255, 241, 100);
}


/* misc
  --------------------------------------------- */

.demo__info {
    position: absolute;
    z-index: 100;
    bottom: 1vh;
    top: auto;
    font-size: 80%;
    text-align: center;
    width: 100%;
}